Novel potentially biobased aliphatic-aromatic copolyesters poly(butylene succinate-co-butylene furandicarboxylate) (PBSFs) in full composition range were successfully synthesized from 2,5-furandicarboxylic acid (FA), succinic (SA), and 1,4-butanediol (BDO) via an esterification polycondensation process using tetrabutyl titanate (TBT) or TBT/La(acac)(3) as catalyst. The characterized by size exclusion chromatography (SEC), Fourier transform infrared (FTIR), (1)H NMR, differential scanning...

The structure, morphology, and thermal properties of biobased biodegradable poly(butylene succinate-ran-butylene azelate) random copolyesters with a wide composition range were studied. These PBS-ran-PBAz copolymers can crystallize in the entire despite being random, displaying eutectic point when their melting is plotted as function composition. Wide angle X-ray scattering (WAXS) studies confirmed isodimorphic behavior where PBS-rich PBS type unit cells some PBAz repeating inclusions vice...

Shape-memory polymers (SMPs) are a class of stimuli-responsive materials that have attracted tremendous attention in various applications, especially the medical field. While most SMPs thermally actuated, relating to change thermal transition (e.g., melting temperature), can be actuated upon exposure light emerging. Recently, there has been new interest into multiple order cover range applications for these smart materials. In this work, poly(ester-urethane)s (PURs) made heating-responsive...

Novel fibrous materials of stereocomplex between high-molecular-weight poly(d- or l-)lactide (HMPDLA HMPLLA) and diblock copolymers consisting poly(l- d-)lactide poly(N,N-dimethylamino-2-ethyl methacrylate) blocks, respectively (PLLA-block-PDMAEMA PDLA-block-PDMAEMA), were prepared by solution electrospinning. Fibers with mean diameters ranging from 1400 to 1700 nm obtained. The formation was evidenced differential scanning calorimetry (DSC) X-ray diffraction (XRD) analyses. Annealing at 100...

Environmentally friendly poly(butylenesuccinate-co-butyleneazelate) (P(BS-co-BAz)s) aliphatic copolyesters with composition-dependent thermomechanical properties were synthesized from succinic acid (SuA), 1,4-butanediol (BDO), and dimethylazelate (DMAz) through a two-step polycondensation reaction. The molar SuA/AzA ratio was varied 4:1 to 1:4, the chemical structure molecular characteristics of resulting (co)polyesters characterized by NMR SEC, whereas thermal crystallinity studied...

Electrospinning is a promising method for producing polymer materials composed of micro- and nanosized fibers. This allows the preparation random aligned fibers different morphologies, such as cylindrical or ribbon-shapes, defect-free with defects, without pores porous. The increasing number studies on electrospinning requires set criteria more complex evaluation fiber morphology topology these to be established. main characteristics necessary electrospun nanofibers have been systematized in...

Smart multiresponsive bionanocomposites with both humidity- and thermally activated shape-memory effects, based on blends of ethylene-vinyl acetate (EVA) thermoplastic starch (TPS) are designed. Thermo- humidity-mechanical cyclic experiments performed in order to demonstrate the as well shape memory properties starch-based materials. In particular, induced-crystallization is used activate EVA response. The results their nanocomposites reflect excellent ability recover initial values higher...

In this study, tannic acid (TA) was investigated as flame retardant agent for PLA. Different strategies to modify its thermal degradation pathway have been explored in order improve charring effect. The first one consi... | Find, read and cite all the research you need on Tech Science Press

In this study, a highly efficient flame-retardant bioplastic poly(lactide) was developed by covalently incorporating DOPO, that is, 9,10-dihydro-oxa-10-phosphaphenanthrene-10-oxide. To end, three-step strategy combines the catalyzed ring-opening polymerization (ROP) of L,L-lactide (L,L-LA) in bulk from pre-synthesized DOPO-diamine initiator, followed chain-coupling reaction reactive extrusion so-obtained phosphorylated polylactide (PLA) oligomers (DOPO-PLA) with hexamethylene diisocyanate...

Furan-2,5-dicarboxylic acid has been introduced in recent years as a green aromatic monomer toward the design of (co)polyesters with enhanced properties, i.e., polyethylene furanoate (PEF) that can definitely compete its petroleum-based counterpart, terephthalate (PET). In an attempt to produce biobased semiaromatic copolyesters efficient eco-friendly approach, we report herein polycondensation diethyl furan-2,5-dicarboxylate (DEFDC) different aliphatic diols and diesters variable chain...

Biodegradation of polyesters driven by enzymes is considered as one the most effective way degradation these materials, a to control plastics accumulation in environment. In this study, we present two different strategies tune enzymatic PBS films triggered lipase from Pseudomonas cepacia. Firstly, kinetics was regulated applying multilayer coats polysaccharide alginate and chitosan (Alg/Chi) films. Secondly, self-degradable were prepared embedding lipase-filled particles. For comparison...

Hydroxyapatite is a well-known bioactive material widely employed in bone regeneration applications. Densifying hydroxyapatite at the nanoscale remains challenging with conventional sintering methods. This investigation focuses on densification of commercially available nano-hydroxyapatite powders through cold process, utilizing water, acetic acid, and phosphoric acid solutions as transient liquids under 360 MPa pressure 200 °C. The study systematically examines influence physical parameters...

The first successful preparation of nanofibers a polyampholyte (N-carboxyethylchitosan) by electrospinning was achieved adding non-ionogenic water-soluble polymer to the spinning solution. Using this approach, other polyelectrolytes, poly(2-acryloylamido-2-methylpropanesulphonic acid) (PAMPS), and copolymers 2-acryloylamido-2-methylpropane-sulphonic acid (AMPS) acrylic [P(AMPS- co-AA)] were also electrospun into nanofibers. polymers polyacrylamide (PAAm) poly(vinyl alcohol) (PVA). average...

The present work reports on the influence of dispersion quality multiwall carbon nanotubes (MWCNTs) in a silicone matrix marine fouling-release performance resulting nanocomposite coatings. A first set coatings filled with different nanofiller contents was prepared by dilution silicone/MWCNTs masterbatch within hydrosilylation-curing polydimethylsiloxane resin. properties were studied through laboratory assays alga (seaweed) Ulva, common fouling species. As reported previously (see Ref....

Two methods, the first physical and other chemical, were investigated to modify surface roughness of polydimethylsiloxane (PDMS) films. The method consisted dispersing multi-walled carbon nanotubes (MWCNTs) magnetic cobalt ferrites (CoFe₂O₄) prior thermal cross-linking, curing composite system in presence a uniform field H. chemical was based on exposing films bromine vapours then UV-irradiating. characterizing techniques included scanning electron microscopy (SEM), energy-dispersive...